Sounds pointless, if they removed the story you may as well just use a mercenary
Not pointless...that is the entire point. If you want to intentionally destroy the origin characters then you should be left with mercenaries.
Each and every origin character has a story centered on who they are before you meet them. Shadowheart is a cleric of Shar and you meet her while she's on a mission for Shar...if you change her then her story makes no sense so you should lose that. Lae'zel is a faithful Githyanki fighter and her story has everything to do with that...if you change that you should lose the story full stop.
Each and EVERY origin character has a very specific story centered on who they are before you meet them. If you don't like that, then fine, you can have mercenaries, but absolutely never a character that doesn't make sense running through their stories.
